Initial commit: 网页联机狼人杀（FastAPI+WebSocket 后端 / React+TS+Sass 前端）

backend/app/game/ai/agent.py

@@ -0,0 +1,46 @@
+"""AI 玩家代理：优先 LLM，失败自动降级到启发式。"""
+from __future__ import annotations
+
+from .fallback import HeuristicAgent
+
+
+class LLMAgent:
+    def __init__(self, player) -> None:
+        self.player = player
+        self.fallback = HeuristicAgent(player)
+        from .llm_client import get_llm_client
+        self.client = get_llm_client()
+
+    async def decide(self, kind: str, ctx: dict):
+        try:
+            from .prompts import decision_messages
+            system, user = decision_messages(kind, ctx)
+            data = await self.client.chat_json(system, user)
+            target = data.get("target")
+            if target is None:
+                return None
+            target = int(target)
+            if ctx["options"] and target not in ctx["options"]:
+                return await self.fallback.decide(kind, ctx)
+            return target
+        except Exception:
+            return await self.fallback.decide(kind, ctx)
+
+    async def speak(self, ctx: dict) -> str:
+        try:
+            from .prompts import speech_messages
+            system, user = speech_messages(ctx)
+            text = await self.client.chat_text(system, user, timeout=40.0)
+            text = text.strip().strip('"').strip()
+            if not text:
+                return await self.fallback.speak(ctx)
+            return text[:300]
+        except Exception:
+            return await self.fallback.speak(ctx)
+
+
+def make_agent(player):
+    from ...config import CONFIG
+    if CONFIG.llm.configured:
+        return LLMAgent(player)
+    return HeuristicAgent(player)